Metallurgical furnace.



S. Z. DE PERRANTI.

METALLURGICAL FURNACE.

APPLICATION FILED JUNE 10, 1907.

962,01 3, Patented June 21, 1910.

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UNITED sTATEs PATENT oEEIoE.

SEBASTIAN zrANI DE EERRANTI, oreEINDLEEoaD BRIDGE, NEAR SHEFFIELD,

ENGLAND.

, METALLURGICAL FURNACE.

' ing or mixing the molten metal contained therein. V I With this object ,the present invention consists in a furnace in which the molten metal is subjected to the inductive action of a.,1noving magnetic field so as to be positively mixed or circulated thereby in a manner analogous to that in which the rotor of an asynchronous motor is driven.

By virtue of my invention-I am able to provide a mixing or stirring apparatus of great simplicity while avoiding the difiiculties hitherto encountered when the attempt has been made to'introduce agents such as electrodes, mechanical stirrers or otherwise into the hot metal.

Referring to the accompanying-drawings, Figure 1 shows a sectional; plan of one form of the invention, Fig. 2 being a corresponding cross-section on the line 2 2 of Fig. 1, while Fig. 3shows diagrammatically a developed view of the windings for producing a moving magnetic field shown in the previous figures. Fig.4 shows another form of furnace having a' special mixing chamber surrounded by windings adapted to produce a rotary magneticfield, Fig. 5 being a diagrammatic plan and'Fig; 6 a, diagram matic development of the windings of Fig. 4, while finally Fig; 7 shows a view of yet another form of the invention.

In carrying m invention into effect'a'ccording to one orm as shbwn applied to an electric inductionfurnace in Figs. 1 to 3, a magnetic core a, has a central limb b, lplassing through the furnace c, the limb b, aving coils f, wound upon it, these coils be- Specification of Letters Patent. Application filed June 10, 1907. Serial No. 378,291.

Patented June 21, 1910.

ling preferably constructed of hollow form so that a cooling medium may be circulated through them. The actual bath of molten metal d, is in the form of an annulus, and in order to produce a circulation of this metal according to the present invention, windin s m, with operative portions normal in proximity to a certain part of this annulus both inside and outside, the windings being carried by the usual iron masses is, in a similar manner to that in an ordinary induction motor. In Fig. 3 the connections of these windings are shown to a three-phase generator. Turnin now to Figs. 4, 5 and 6, a modification o the invention is shown' in which furnace by the induction coils f, and core a, as before runs down to a special chamber n disposed at the bottom of the furnace, which ried by iron masses is, as before to produce a rotary magnetic field which, acting inductively upon the moltenmetal contained in the chamber n, will serve to circulate or mix it.

Yet another form of the invention is shown in the Fig. 7,'according' to which three magnetic cores 6, thread throu h the bath 0 and are connected top and ottom by end pieces 0. Around the magnetic cores, windthe bath, these windings being connected as In this example. separate sets of 'coils for heating and mixinga's in- Fig. 4, are dispensed with, the one set of coils serving a double function.

Having now described my inventionwhat I claim as new and desire to secure by Letters Patent is 1, A furnace having upper part provided w th heating means for producing metal in the molten state and a mixing the metal in said lower chamber.

to the rec surface of the metal are arranged shown to a source of three-phase current.

the metal melted in the "upper part of the ings g, are arranged both above and below 2. A furnace having in combination a receptacle for molten metal; iron masses in chamber is surrounded by windings m, carin combination an r lower chamber in which said molten metal collects together with means for inductively proximiy in said. reeepteeleenci multiphase windings having operative portions spaced around said receptacle and normal to the free surface of said metal.

3 A furnace having in combination a receptacie ion molten metal; izon i" aeses in proximity to said receptacle znni iphese Wineiings having operative pori'zion eisposei outside said. molten metal and normal to its I'i'ee suyface. I

in testimony whereof, i my signature in presence of two witnesse v SEBAS'ZELN ZIANE FERRANGJZ.

W itnesses HERM Josn: 

